NORTH AMERICAN PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME (PRRS) VIRUS AND USES THEREOF

摘要

The invention provides isolated polynucleotide molecules that comprise a DNA sequence encoding an infectious RNA sequence encoding a genetically- modified North American PRRS virus, methods to make it and related polypeptides, polynucleotides, and various components. Vaccines comprising the genetically modified virus and polynucleotides and a diagnostic kit to distinguish between naturally infected and vaccinated animals are also provided.